Mounting structure for grinding wheels



Sept. 30, 1952 F. e. K RA FFT MOUNTING STRUCTURE FOR GRINDING WHEELS 2 SHEETS4-SHEETV 1 Filed June 12, 1950 R m w m jmhoa Patented Sept. 30, 1952 12%: I

UNITED STATES PATENT OFFlCE MOUNTING STRUCTURE FOR GRINDING WHEELS 'Frederich G. Krafft, Springfield, Ohio, assi'gnor to The Thompson Grinder Company, Springfield, Ohio, a corporation of Ohio Application June 12, 1950, Serial No. 167,530 2 Claims. (01. 5l-267) 2 v This invention relates to grinding apparatus It is therefore an object of this invention to and particularly to apparatus relating to supplyprovide an improved structure by which cooling ing cooling fluid to the grinding wheel of the apfluid can be supplied to th internal structure of 1 paratus. i a grinding wheel for flow through the grinding In in pr ce s using abrasive grinding 5 wheel to the peripheral grinding surface. i

wheels a large amount of heat is developed in It is stillanother object of the invention topic and between the work and the grinding wheel vide a structure in accordance with the foregoing.

while being ground by the grinding wheel, and object wherein the hub mountingfor thegrind'ing. particularly at the point of the grinding contact wheel provides the distributing means for. dis-j between the work and the grinding wheel. Cooltributing cooling fluid to the internal structure" ing fluids have, in the past, been supplied to or a grinding wheel so thatthe hub mounting".

r n wheels and the work for the purpose of provides the dual purpose. of distribution of the. maintaining the temperatures of the work as near cooling fluid as well as co 'axial mounting of the as possible to normal room temperature to pregrinding wheel on a drive shaft or spindle.

vent burnin of they k piece, and also to avoid Another object of the invention is to provide,

r pid deterioration of the grindin wheel. Sparks 1 an improved structure in accordance .withthedischarged from a ground surface by a grinding foregoing objects that is constructed and are:

wheel is merely a representation of the high temranged for relative ease of, manufacture and onperature involved in removing the surface metal which a standard grinding wheel can be mounted of the Work during the grinding process. to thereby eliminate any necessity of special It has been found that the finished product remanufacture of grinding wheels to obtain. unisulting from a grinding operation is greatly enform distribution of cooling fluid throughoutthe hanced if the temperature of the metal being reinternal structure of the grinding wheel. moved is retained low bya full and adequate sup- Further objects and advantages will become P y of cooling fluid the immediate po t o apparent from the drawings and the following degrinding contactbetween the grinding wheel and scription. r v the work being ground. Figure 1 is a vertical cross-sectional View of an owe e due to the fact that the grinding improved grinding wheel mounting structure in wheel is bearing directly upon the work piece that corporating features of my invention and as taken is being ground it has been exceedingly difficult along line l--l of Figure-2.

to apply an adequate supply of cooling fluid to Figure 2 is a vertical cross-sectional view taken the "immediate point of contact between the substantially'along line 2-2 of Figure 1 but with grinding'wheel and the work. The usual practice portions of the apparatus broken away to illus-- has been to direct jets of cooling fluid directly betrate more fully the construction of the. ,ap

neath the wheel at the point of contact between paratus. 1

the grinding Wheel and e k p Figure 3 is a cross-sectional view taken along In more recent developments there has been line 3-3 of Figure 2.

apparatus provided for the purpose of supplying Figure 4 is a cross-sectional view taken along a cooling fluid to the immediate point of grinding line 4-4 of Figure 2.

contact between the wheel and the work piece by 40 Figure 5 is a vertical cross-sectional view like causing the cooling fluid to flow through the Figure 1 but illustrating a sleeve mounting bearinner-structure of the grinding wheel and dising for the spindle in place of a-ball bearing charge'at the peripheral surface of-the grinding mounting. 7 I I wheel at the point of grinding contact with the The grinding wheel 10 and hub mounting work pi to ta a c nstant now of coolin structure l5 for the same is supported upon a fluid at the specific point. drive shaft or spindle 1 I that is suitably journaled.

When the cooling fluid is so supplied through a in the machine frame It by means of anti-friction grinding wheel it is highly effective both in lubriball bearings 13 which are held within the frame. eating the work piece being ground, for coolingthe by a retaining ring I4 and having suitabl grease metal being removed and for washing the surface retaining rings l 6 associated therewith of the grinding wheel free of particle inclusions. The grinding wheel 10 is provided wit1; a een tral axial opening [1 that engages the periphery of a mounting hub l8 thereby supporting the grinding wheel in directly upon the hub. The hub 13 has a tapered axial opening 1-9 that receives the tapered end 20 of the spindle shaft ii, a nut 2i being threadedly received on the threaded end 22 of the shaft l l to secure the hub IS on the spindle shaft I I.

The grinding wheel I is secured in fixed position on the hub l8 as retained between a pair of annular flanges 25 and 23. The flange 26 is secured to the hub l8 by means of cap screws '30, shown in Figure 4, the cap screws extending through an annular projection 3| that extends around the periphery of the hub 18. The flange 25 is secured to the hub by means of cap screws 32 shown in Figure 1, which extend through the annular projection 3| on thcihub [8.

The flange 25 has an inwardly extending an nular projection 33 that rests upon an annular ledge 46 provided on the hub 18 and through which the cap screws 32 extend. This inwardly projecting annular extension 33 in the inner periphery of the flange 25carries a series of holes 34-thatcommunicate with a series of holes 35 provided around the periphery of the hub 18 and extending-axially-of the hub parallel with the axis thereof (through .the-annularproj ection 3! on the hub l8.

The holes=35 communicatewith theperipheral surface36 of the projection 3| by means of slots that extend inwardly from the peripheral surface 35 into "engagement'with the holes 35, each hole? 35 :thus having a tangential communicatin slot 31 through whichnliquid is delivered from th'e hole 35 to the inner-peripheral surface of the axialwopening IT in the grinding wheel in. A closure plate '38 is provided along oneside of the holes 35, seeFigure' 3, to close the slots 3'! at one end' thereof while beingprovided with holes 39 that align'with the hole 35 to permit liquid to enter into holes 35 through the closure plate 38. The opposite end of theholes 35 is closed by the flange 26, as illustrated in Figure 3.

'The'flange 25 has an'annular recess 40 that receives a disc4i. The disc 4! has a central recess 42 that provides a cavity or chamber 43 adjacent'the front wall 44 of the hub l8 to receive liq'uid'as supplied through'a' pipe '45 from a suitable source of supply of cooling liquid.

A shield '50 is placed around the'grindingwheel l0 and'is suitably supported upon the machine frame l2 theshield preventing liquid from spraying over the machine frame.

In' operation, upon rotation of the grinding-wheel I0 and its hub' mounting structure through the spindle ii that is driven iniany conventional manner, liquid supplied through the pipe 45 into the cavity 43 will be cen-' trifuged radially in the cavity 43 for passage through the holes 34 in theflange 25 and thenceinto the holes 35 in the hub i8.

From the holes 35 in the hub i8 liquid will be supplied to the'tangentially andradially disposed slots 31 that engage the inner periphery of the axial opening IT to' apply liquid against the.

peripheral surface of the axial opening l'l. Coolin'g" liquid will move through the body of the grinding wheel wheel under the action of centrifugal-iforce'working'on the 'liquid'until the liquid reachesthe outer peripheral surface of the grinding w'heelatwhich it isdischarged.

during rotation of the grinding It will be noted that the actiontof the hem trifugal force *ontheliq'u'id coolant supplied to the inner periphery of the axial opening I! of the grinding wheel I0 is limited to the action of the force on the column of the liquid that is in the slots 31 which would be in addition to the pressure applied to the body of liquid by centrifugal force acting upon that portion of the liquid within the chamber 43. In effect therefore the cooling liquid is supplied to the slots 31 as a fluid under pressure and only after the liquid enters the slots 31 does direct centrifugal action affect the movement ofthe liquid into the body of the grinding wheel l0.

In Figure 5 there is illustrated a slightly modified structure wherein the spindle Ila is carried in a sleeve bearing 60 that is mounted in the machine frame l2a. The shaft Ila is lubricated in the sleeve bearing 60 through the passages 6 I, and a suitable lubricant-seal 62 is provided at the forward end of the sleeve bearing.

The hub lBa carries an annular ring 65 secured thereto by cap screws 66 that retains the flange 2 60. upon the hub [8a.

In other respects the structure illustrated in Figure 5 is the same as that illustrated in Figure 1 so that like parts are given correspondingireference numerals but with the suffix a added thereto. Also, the device of Figure 5 operates in the same fashion as that heretofore discussed with reference to the devices'of Figure 1.

While the apparatus-disclosed and described herein illustrates preferred forms of the inven-' tion, yet it will be understood that there :are structural modifications that can be made without departing from the spirit of the invention,"

and that those modifications that fall Within the scope of the appended claims are intended to be included herein.

Having thus fullydescribed'my invention, what I claim as new and desire to secure by Letters hub having a plurality ofvpassageways therein arranged substantially parallel to'the central axis of said hub and'adjacent the outer peripheral face thereof, said passageways being closed at their outer ends by said clamping plate, radially disposed slots communicating with said passageways and extending to and opening against .said

inner peripheral face of the grinding wheel, said" slots being closed at their outer faces by :said

inner peripheral face and connecting. said passageways thereto whereby coolant may baconducted through said hub and delivered against the inner peripheral face of the grinding-wheelfor movement through the body of said wheel and onto the outerperipheral working surface thereof.

. 2 Mechanism for feeding liquid through the body of anabrasive wheel which comprises .in

combination, rinding wheel having a central of said clamping plates and adj acent the-outerperipheral face thereof, said passageways; being. closed at their outer ends by saidhub,-radiallydis-- posedslots' communicatin'g 'withsaid passageways 5 6 and connecting the same with said inner periph- UNITED STATES PATENTS eral face of said grinding wheel, said slots being Number Name Date closed at their outer faces by said inner peripheral 455 277 Cummins "June 30 1391 wheel face, and means comprising a recessed disc 7261166 Stolzenberg 1905 forming a chamber for liquid coolant disposed on 5 2371699 Wmken et aL 3 1945 one side of said hub and connected with a source 2378 070 Eastwood June 12, 1945 of coolant supply, and ports connecting said 2 380332 Scheer July 10 1945 chamber with said passageways in said hub n whereby coolant may be conducted to and de- FOREIGN PATENTS livered against the inner face of said grinding- 10 be Country Date wheel. 500,485 Germany Jan. -23. 1929 FREDERICH G. KRAFFI.

REFERENCES CITED The following references are of record in the 15 file of this patent: 

